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And Finally, (thank you for bearing this far)
I am submitting the form in which <tr> are defined (First Code above) whose action"Submit_package_details.jsp"
Here is the Code for Submit_package_details.jsp:

I can't find a form with action Submit_package_details.jsp, where's it ?
Again, honestly, this code is horrible, follow certain best practices, No scriptlet's if possible, otherwise keep it minimum, No database calls from JSP, instead of using bare XMLHttpRequest you are better at using some library like jquery.

I just can't find the relevant code from what you have posted, otherwise getting the paramterer values is straight forward, Look at this Servlet request article. Try firebug to see if the form is submitted properly.